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List the two main propositions of Oparin...

List the two main propositions of Oparin and Haldane.

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The two main propositions of Oparin and Haldane are -(i) Chemical evolution. Organic molecules were formed from inorganic molecules (`CH_(4),H_(2),NH_(3)`, Water vapours) under special conditions i.e. high temperature, energy from electric discharges and high energy radiations.
(ii) Organic/Biological evolution. It involves origin of first-form of life from pre-existing non-living organic molecules, about 2,000 million years ago.
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